David Sklansky's Theory of Poker
Sklansky's Theory of Poker is not an easy read, but it is one the fundamental books of modern poker Written by Jesse McLean
When big name professional players are asked what books they reccomend, the one that seems to crop up all the time (after their own) is The Theory of Poker. The third edition of this book might have been published in 1989, but it is still one of the absolute best books out there.
Theory of Poker is often recommended by lesser known pros too. People whose names you have never heard, but who consistently beat four or more tables of 15/30 on the Internet for a big bet an hour. I did a quick survey of my acquaintances, and TOP (it's so popular, it's got an acronym) appeared on about 3/4 of people's top three lists.
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